Quelle  verifier_unpriv_perf.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/unpriv.c */

#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

SEC("perf_event")
__description("unpriv: spill/fill of different pointers ldx")
__failure __msg("same insn cannot be used with different pointers")
__naked void fill_of_different_pointers_ldx(void)
{
 asm volatile (" \
 r6 = r10;     \
 r6 += -8;     \
 if r1 == 0 goto l0_%=;    \
 r2 = r10;     \
 r2 += %[__imm_0];    \
 *(u64*)(r6 + 0) = r2;    \
l0_%=: if r1 != 0 goto l1_%=;    \
 *(u64*)(r6 + 0) = r1;    \
l1_%=: r1 = *(u64*)(r6 + 0);    \
 r1 = *(u64*)(r1 + %[sample_period]);  \
 r0 = 0;      \
 exit;      \
" :
 : __imm_const(__imm_0,
        -(__s32) offsetof(struct bpf_perf_event_data, sample_period) - 8),
   __imm_const(sample_period,
        offsetof(struct bpf_perf_event_data, sample_period))
 : __clobber_all);
}

char _license[] SEC("license") = "GPL";